Question

Find a cubic function with the given zeros.
(x-sqrt2)(x+sqrt2)(x+2)

Answer 1

In layman's terms, expand this expression.

Answer 2

\[(x^2+x \sqrt{2}-x \sqrt{2}-(\sqrt{2}*\sqrt{2}))(x+2)\]

Answer 3

how do you multiply the sqrts

Answer 4

Remember that \((x - y)(x + y) = x^2 - y^2\).

Answer 5

\[(x^2+x \sqrt{2}-x \sqrt{2}-2)(x+2)\]

Answer 6

@torobi Look at my formula and apply it to the first two brackets.

Also, \(\sqrt{y} * \sqrt{y} = y.\)

Answer 7

what if \[-\sqrt{y} * \sqrt{y}\]

Answer 8

in that case, it will be -y. Think \(-(\sqrt{y} * \sqrt{y})\)

Answer 9

ok so my answer was is that correct